Question

我的目标是在用户通过鼠标移动时防止部分或全部隐藏。例如，如果我的桌面分辨率为1024x768，则表格位置属性的坐标的最小值/最大值为“x / y”：0,1024 - form.width，0,768 - form.height。

我使用一些原生APi完成所有这些并且一切正常，但我经常注意到我的表单刷新（闪烁）（我正在管理form_move事件）。
似乎SuspendLayout方法不能正常工作，否则表单移动事件不会触发每个像素更改，但可能不止一个（请参阅下面的代码以实现我的意思）。

我的代码如下所示：

private void Form1_Move(object sender, EventArgs e)
{
    this.SuspendLayout();

    // Desktop Resolution (API utility)
    int x = Desktop.GetXResolution();
    int y = Desktop.GetYResolution();

    // Taskbar Info (API utility)
    Taskbar tb = new Taskbar();
    int minX = 0;
    int maxX = x - this.Width;
    int minY = 0;
    int maxY = y - this.Height;
    if (!tb.AutoHide)
    {
        if (tb.Position != TaskbarPosition.Unknown && !tb.Size.IsEmpty)
        {
            if (tb.Position == TaskbarPosition.Top) minY += tb.Size.Height;
            switch (tb.Position)
            {
                case TaskbarPosition.Top: minY = tb.Size.Height; break;
                case TaskbarPosition.Bottom: maxY -= tb.Size.Height; break;
                case TaskbarPosition.Left: minX = tb.Size.Width; break;
                case TaskbarPosition.Right: maxX -= tb.Size.Width; break;
            }
        }
    }

    // Restore X Position
    if (this.Location.X < minX) this.Location = new Point(minX, this.Location.Y);
    if (this.Location.X > maxX) this.Location = new Point(maxX, this.Location.Y);


    // Restore Y Poistion
    if (this.Location.Y < minY) this.Location = new Point(this.Location.X, minY);
    if (this.Location.Y > maxY) this.Location = new Point(this.Location.X, maxY);

    this.ResumeLayout(false);
}

正如我已经说过的，通常当我恢复位置属性时，我的winForm会闪烁。

任何建议都将受到赞赏。

Answer 1

移动完成后发生

Move。表单已移动，然后您将其移回。无论如何它会闪烁。

相反，请防止它首先移动：

private const int WM_MOVING = 0x216;

private void WriteTheRect(IntPtr dest, Rectangle rect) {
    System.Runtime.InteropServices.Marshal.WriteInt32(dest, 0, rect.Left);
    System.Runtime.InteropServices.Marshal.WriteInt32(dest, 4, rect.Top);
    System.Runtime.InteropServices.Marshal.WriteInt32(dest, 8, rect.Right);
    System.Runtime.InteropServices.Marshal.WriteInt32(dest, 12, rect.Bottom);
}

protected override void WndProc(ref Message m) {
    if (m.Msg == WM_MOVING)
    {
        // RECT structure pointed to by lParam: left, top, right, bottom

        Rectangle r = Rectangle.FromLTRB(System.Runtime.InteropServices.Marshal.ReadInt32(m.LParam, 0),
                                         System.Runtime.InteropServices.Marshal.ReadInt32(m.LParam, 4),
                                         System.Runtime.InteropServices.Marshal.ReadInt32(m.LParam, 8),
                                         System.Runtime.InteropServices.Marshal.ReadInt32(m.LParam, 12)
                                         );

        Rectangle allowed = Rectangle.FromLTRB(0, 0, 1600, 900);

        if (r.Left <= allowed.Left || r.Top <= allowed.Top || r.Right >= allowed.Right || r.Bottom >= allowed.Bottom)
        {
            int offset_x = r.Left < allowed.Left ? (allowed.Left - r.Left) : (r.Right > allowed.Right ? (allowed.Right - r.Right) : (0));
            int offset_y = r.Top < allowed.Top ? (allowed.Top - r.Top) : (r.Bottom > allowed.Bottom ? (allowed.Bottom - r.Bottom) : (0));

            r.Offset(offset_x, offset_y);

            WriteTheRect(m.LParam, r);
        }
    }
    base.WndProc(ref m);
}

显然，用你想要的实际边界替换常量。

表单在客户端桌面区域内移动

1 个答案: